Back in law school Sally Stowe and Colin Foster argued in and out of class. One night, after a study session in the library, Colin offered to drive Sally home. They ended up in his dorm room making love. The next day Sally discovered that her best friend, Beth, was really into this guy in Sally's class — Colin. Sally stepped aside and started seeing someone new.

Sixteen years later Sally is a distinguished lawyer, up for a judicial appointment, and Colin is Beth's widower. As Sally and Colin spend more and more time together, a horrible suspicion takes hold. Could Sally's daughter be Colin's?